1. 這是甚麼文法
I am in Hong Kong. 我 (現正) 身在香港
句子結構： S + LV + predicate adverb
例句：I am home.
"in Hong Kong" is a prepositional phrase functions as predicate adverb telling the position 位置 of the subject.
Unlike adjunctive adverb, "predicate adverb" is obligatory 強制性的，不能省略。
I am in love. 我 (現正) 戀愛了
句子結構： S + LV + predicate adjective
例句：I am ill.
"in love" is a prepositional phrase functions as predicate adjective modifying the subject to tell its state or condition 狀態或情況. In grammar, it is also called "subject complement" (S+LV+SC).
那 in + noun 就是形容詞?
No, it depends on the meaning of the preposition "in". In most cases, it is adverb, except for:
(i) "in" = wearing something
例 She is all in black.
(ii) "in" = showing state or condition
例 She is in danger.
The house is in good repair.
2. I am loving you 同 I am a good boy 原理一樣?
錯了。絕對不一樣!
I am loving you 是 "現在進行式"，但文法錯誤. "love" (解"愛情"時) 不能有"進行式" (continuous tense)。
3. I am flying.
動詞+ing = present participle 現在分詞
現在分詞 除了表達現在進行時態，一般亦可作形容詞。
The object is flying. ~ a flying object
The teacher is dancing. ~ a dancing teacher
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